to age; to deteriorate with age; old and weak

to decline; to fall; to drop; to falter; a decline; recession (in economics)

organ failure; exhaustion; prostration (medicine)

loser; jerk

weak; feeble

unfailing; never weakening; enduring; unstoppable

to express pessimistic views about (sth)

to age prematurely; premature senescence

to flourish then decline; rise and fall

prosperity and decline (of a kingdom); rise and fall